Warnings using php on win98se using pws or apache

Hi im using win98se with apache and have also tried pws. Im using all latest versions of the software. When im using any scripts downloaded from the internet such as auction scripts i get the following warning messages throughout the pages Warning: Use of undefined constant getSessionVars - assumed 'getSessionVars' in C:\Inetpub\wwwroot\includes\sessions.inc.php on line 40 Warning: Use of undefined constant putSessionVars - assumed 'putSessionVars' in C:\Inetpub\wwwroot\includes\sessions.inc.php on line 98 Warning: Use of undefined constant removeSession - assumed 'removeSession' in C:\Inetpub\wwwroot\includes\sessions.inc.php on line 167 Warning: Undefined variable: YA_SESSION_ID in C:\Inetpub\wwwroot\includes\sessions.inc.php on line 211 Warning: Cannot add header information - headers already sent by (output started at C:\Inetpub\wwwroot\includes\sessions.inc.php:40) in C:\Inetpub\wwwroot\includes\sessions.inc.php on line 217 Warning: Undefined variable: bid in C:\Inetpub\wwwroot\includes\messages.inc.php on line 58 Warning: Undefined variable: SESSION_ID in C:\Inetpub\wwwroot\includes\messages.inc.php on line 169 Warning: Undefined variable: id in C:\Inetpub\wwwroot\includes\messages.inc.php on line 313 Warning: Use of undefined constant ActualDate - assumed 'ActualDate' in C:\Inetpub\wwwroot\includes\dates.inc.php on line 24 Warning: Use of undefined constant ArrangeDate - assumed 'ArrangeDate' in C:\Inetpub\wwwroot\includes\dates.inc.php on line 80 Warning: Use of undefined constant ArrangeDateMesCompleto - assumed 'ArrangeDateMesCompleto' in C:\Inetpub\wwwroot\includes\dates.inc.php on line these particular warnings were using pws and phpauction.org software. The same erros occur when setup with apache thanks Robbie demon_reaper@ntlworld.com